Waffle-iron heating element



F. F. FORSHEE wAFFLE IRON HEATING. ELEMENT Filed oct. 1o. 1925 1 Sept.11, 1928. n 1,684,176

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' f 4&4 BY w T'TORNEY Patented Sept. r11, 1928.

UNITED STATES 1,684,176 PATENT OFFICE.

FRANKVF. FORSHEE, `0F MANSFIELD, OHIO, ASSIGNOR T0 WESTINGHOUSE ELECTRIC&

MANUFACTURING COMPANY, CORPORATION OF PENNSYLVANIA. i

WAFFLE-IRON HEATING ELEMENT.

kApplication filed. Uctober 10;. 1925. Serial No. 61,696.

My invention relates to electric heating devices and particularly toheating elements tor such devices.

An object of my invention is' to provide a heatingr unit that shall havegood thermal engagementwith thesuiface tolbe heated.

Another object of mv invention to provide aheating element that shallhave hieh thermal conductivityand shall bev ,simple in construction,economical and easily vmanufactured.

Another object of, my invention is to provide a heating: unit that'shall have means for exerting pressure on the surface to be heated,thereby increasing the eiiiciency of the heating unit, andthuscompensate for any reasonable irregnilarities'in the dimensions ol thecontainers in which the heating` unit is located. Y

Heretofore. it .has been found necessary tol pack heat-resistantmaterial. such as'asbestos, or mineral wool, against the heating unit inorder to hold it firmly against the surface to be heated. By meaiisoi myinvention, I have.

successfully;` .produced a device that shall exert pressure against thesurface to be heated by reason et the resilient supports attached to theends of the heating unit, thereby eli minating the necessity for usingsuch heatresistant materials.

In the accompanying drawings,

Figure 1 is a view of an electric waflle iron, partially insectiomshowing the relative position of the heating unit and the surfaceto be heated, v w

Fig. 2 is a view, partially in plan and partially in section, ot theheating unit embodying my invention, y

Fi g. 8 is a View, partially in section, taken alongV the line III-IIIof the heating unitillustrated iii Fi g. 2, and

Fig. 41 is a sectional view taken alongr line IVHIV otFig. 2. f

Referring more particularly to Fig. 1, a

vwaiile iron structure 11 comprises two conthe tainers 12 andk 13supported by lens 14.'

Levers 15 and 16, supported on the pivots 17 serve as means `for movingthe containers 12 and 13 relatively rtoeach, other. A heating unit 18 isdisposed in each ot the containers and its surface isk held in intimatecontact with the baking' members 19.

In Fig, 2, I have shown more clearly the combined construction of theheating; unit 18 and a supporting means 21 therefor. The

bers 22 and 23 with met-al `.qfibs 24 located therein, enclosing aresistor 25. The resistor 25 is insulated trom the sheath members 22 and23 `and the gibs 24- by insulating material 2G. such mica. The twosheathsk22-and 23 f have extending portions 27.y that are bentk in theform shown in Fig, 3. so as to be resilient. The supports 21 are ofsubstantially C-shape and are joined to the laterally-extending portions27 by clamping the lower edge ofthe portion 27 around the ends of thesupports 21 The supports 21 may he made to join more firmly with thelaterally-extending portions 27 b v spot weldin them in addition to bendinn' the lower ed ge of the portion 27 around th el supports. .i A

, In placing the heating units in the containers 12 and 13, the supports21 are bent inwardly and underneath the sheath members 22 and 23 andsubsequently placed in said containers. The baiting members 19, of

which one only is shown7 are then pressed down onto the sheaths 22 and23 an l fastened by means of screws not shown) to the casingzs 12 and13. yBy reason oi the `resiliency of the portions 27, a pressure isexerted against the baking members 19 and the degree of the pressureexerted depends upon the defiection inwardly oi the portions 27.

The bent extremities 28 of the supports 21 tit firmly against the sidesot the container and. since the opening in the C section of thesupporting members 21 may be varied, any4 reasonable irregularities inthe size of the containers may be compensated ttor, and the pressureexerted on the sides of the containers will be sufficient to maintainthe heat 'infr units 18 in their operative positions.

' 29, shown in Figs. 2 and d, to receive terminals 31, whereby theresistors 25 may be connected to an electric circuit. The terminals 31are insulated from the supports 21 by mica kwashers32. The supports 21attached to the laterally extending' portions 27 of the sheathed members22 and 23, do not lie parllei with the sheath members 13 because of theresiliency of theportions 27 so that the pressure required to producethe thermal conductivity' into the baking,` surfaces will be supplied bythe heating' unit 18 in combinan tion with the aforesaid members 21 andthe resilient portions 27.

Various other modifications and applica- 'heating unit 18 comprises twosheath memtions of my heating; unit maybe made without departing tronithe spirit and scope of my invention. I desire, therefore, that onlysuch. limitations shallA be placed thereon as shallbe imposediby theprior art.

I Claim as my intention:

l. In con'ibination, an electric, heating unit Comprising` a pluralityot elongated,` encased heating:` elements, resilient. laterally-extend`ing portions at the ends thereof, and a pair ot resilient-supports oinedto said resilient por tions.

2. In combination, an-eleetrie heating-unit comprising;- a plurality7 otsheathed heating elements hai-'ing integral latei'ally-extending,resilient portions at the ends thereof, and a supporting means, ofsnbstantiall;7 C-shape, joined to said laterally-entending resilientportions and extending; irm-'ardlv therefrom.

In a Cooking device,- thc Combination With a. container anda bakingmember associated therewith, o' aheating unit comprising pluralitY ott-hern'iall)Y conductive sheathed resistor elementsthcrein,andembod-ying' resilient means tor inaintaining'the thermally eonduetivesheaths in proper operative relation to said bahingmember.

4. In:y a- Cookingdevice, the combination with a.- container-anda-baliing` member associated-therewith, ot a. heatingunit loeated in thecontainerl and comprisingaplurality' of t-hermally-conductive sheathedmembers having; resilient laterally-extending-V end' portions, andresilient supporting; members seeuredthereto and4 effective-to maintainthe heatingA mea-ns in intimate Contact with, and in proper operativerelation to, said baking member.

5. nan ele-etrio appli ance,.the comliination n-'ithaeontainerandabaling member associated therewith, ot av heating` unit comprisinga-pairot sheath ed resistors which are eleetrically insulated therefrom,haring later` alljv-extendingresilient end portions, a pair ot resilientsupporting members, ot substant-iallx-Y C-shape, secured to saidresilient' end portions, and terminalsllor the heatingmeans mounted on,and insulated from, one ot the supportingmembers.

G.- l-n an electric appliance, the combina tion with a. container and abah-ingr member associated therewith, of a heating unit loeated infsaidI container and comprising" a pluralitjg7 ot'res-istor members,elongated supports 'for the resistor men'ibers having;lateralbi-extending,i integral end portions, and resilientsupportingmembers seein-ed to the end portions :tor holdingthe heating nnit inclose operative engagement with said baking` ineinber.

7. In combination, an electric heatingunit Comprising; a pluralitg7 ot'resistor members, supports therefor having resilient end portions, and aresilient member extending' laterally'ot said supports and joinedto-said resliem` end portions.-

In testimony Whereoli, l hai-e hereunto-subscribed' my name this-29thday Sept., 1925.

FRANK F. FORSE-IEE.

